Performing the: A Step-by-Step Tutorial Flutter Kicks
Extend your legs fully out with a slight bend in your knees. Lift your heels about 6 inches off the floor.
Keep your abdominal muscles pulled in so that you move your legs from your core, rather than your hip flexors.
Now, start the movement by lifting the left leg higher than the right leg, then lowering it as you lift the right leg higher. This should create a 'fluttering' motion.
Continue this alternating movement for the desired amount of time or repetitions, making sure to keep your abs engaged and your lower back pressed into the mat.